While we're all getting pedantic and esoteric, in zsh you can do this:

path+=(~/.local/bin)

You don't even have to use the "export" keyword. Not that I would do this, but since we're all pointing out random shell stuff...

(In zsh the lowercase "path" variable is an array that's automatically tied to the $PATH string, so you can just add to it using parens to signify new array elements, separated by a space.)